Even though we're going to be whoa'd and inspired by the future that Google Glass and the Apple iWatch will bring, let's not kid ourselves. The most realistic future is going to be the silly arguments we all get into about Google Glass and the Apple iWatch... which will only get more ridiculous after Apple releases its own glasses and Google makes a watch. It's the next level of Android vs iPhone. The future is going to suck. At least we have Joy of Tech's amusing comic to laugh at before it happens. [Joy of Tech]
I think the smartphone is convenient enough and functional enough that it renders both the Glass and an iWatch unnecessary luxuries.
That said, Glass has more potential, if only for the promise of real augmented reality and full integration with Google Now. On the other hand, I can't see how an iWatch would be any different from a tinier, wrist-mounted iPhone.